NGC3576 Ha widefield

multiweb (Marc) · #1 30-04-2010, 12:16 PM

Last night was great. Heavy moon but no wind and relatively dry so the best time to do a bit of Ha. Here's 2 panels I did around NGC3576. Peter W. posted a beautiful close up of the loops here which gave me some incentive to try the area in Ha. I did some RGB previously and put the time on it with an ED80 but it's quite faint and hard to extract from the myriad of background stars.

In comparison it was a breeze to get those photons under a full moon with the hyperstar. So it's 1h in 5min subs on each panels. QHY8 with Baader Ha 7nm on C11/Hyperstar 3 combo, guided with PHD/QHY5 in GSO 8x50mm finder.

There's a larger better quality crop without jpg artifacts here [700KB] and finally the full field mosaic is available to view here [2.6MB]

Enjoy the shots and thanks for looking

strongmanmike (Michael) · #2 30-04-2010, 12:27 PM

Sure a lot of Ha there Marc

Great job

Mike

h0ughy (David) · #3 30-04-2010, 12:35 PM

so are there the same number of stars? Nice one - though you do not have a flat field - looks like you have a small bit of vignetting. Its marvellous how much stuff is up there

multiweb (Marc) · #4 30-04-2010, 12:50 PM

Quote:

Originally Posted by strongmanmike

Sure a lot of Ha there Marc

Great job

Mike

Thanks Mike.

Quote:

Originally Posted by h0ughy

so are there the same number of stars? Nice one - though you do not have a flat field - looks like you have a small bit of vignetting. Its marvellous how much stuff is up there

Thanks David - I was waiting for you to do a re-count on your RGB before putting numbers on the table

No vignetting no, it's a mosaic

My field is like the weather. As good as it gets that day as I'm moving and disassembling the scope every session. Bit of mirror tilt possibly, shifting focus, lazy operator, who knows?

But I'm not that picky. I enjoy the shots for the whole vista not the corners stars.

Bassnut (Fred) · #5 30-04-2010, 01:49 PM

Looking good Marc, the loops came out well with only 1hr, as they are quite dim.

telecasterguru (Frank) · #6 30-04-2010, 01:54 PM

Marc,

Really well done, I can't wait for the hyperstar for the 10"RC or ED127 to turn up.

Frank

dugnsuz (Doug) · #7 30-04-2010, 02:02 PM

Nice work Marc.
You should try a HaRGB blend with your previous data.
Doug

multiweb (Marc) · #8 30-04-2010, 04:26 PM

Quote:

Originally Posted by Bassnut

Looking good Marc, the loops came out well with only 1hr, as they are quite dim.

Thanks Fred. Yeah and that was under the full moon too... and my d**khead next door neighbourg put his veranda lights on too coz he saw me imaging (he's a bit like that

). You gotta love narrow band with the hyperstar.

Quote:

Originally Posted by telecasterguru

Marc,

Really well done, I can't wait for the hyperstar for the 10"RC or ED127 to turn up.

Frank

Thanks Frank.

I don't believe they do one for RCs as you would have to remove the seconday mirror and certainly not for an ED refractor. The Hyperstar is bunch of lenses that replace the secondary mirror in an SCT design so you use only the primary FL which F/2 in most SCTs. That'd be cool to use that on a RC tough if they ever make one...

Quote:

Originally Posted by dugnsuz

Nice work Marc.
You should try a HaRGB blend with your previous data.
Doug

Thanks Doug. I do have a bit of RGB on it with the ED80 but it doesn't cover all the area. Might play with it though see what comes out of it if I get enough overlap. Good idea.

Peter Ward · #9 30-04-2010, 05:00 PM

Noise well controlled. Nicely done

multiweb (Marc) · #10 30-04-2010, 05:53 PM

Quote:

Originally Posted by Peter Ward

Noise well controlled. Nicely done

Thank you very much.

troypiggo (Troy) · #11 30-04-2010, 06:59 PM

Well done mate. Ripper. Really turning out some great images.

seeker372011 (Narayan) · #12 30-04-2010, 08:55 PM

once again I like your nice tight stars!

multiweb (Marc) · #13 30-04-2010, 09:14 PM

Quote:

Originally Posted by troypiggo

Well done mate. Ripper. Really turning out some great images.

Quote:

Originally Posted by seeker372011

once again I like your nice tight stars!

Thanks guys - I very much appreciate the comments.

Hagar (Doug) · #14 30-04-2010, 09:15 PM

Very nice Marc. The detail is very sharp. Quite comparable to Peters be it a bit smaller.
Well done.

multiweb (Marc) · #15 30-04-2010, 09:28 PM

Quote:

Originally Posted by Hagar

Very nice Marc. The detail is very sharp. Quite comparable to Peters be it a bit smaller.
Well done.

Thanks Doug. It's ok on one side of the field. Unfortunately I had to do a meridian flip and the mirror weight shifted so as a result I didn't go as sharp as I wanted on the left portion of the picture. I reckon I might get a rubber mallet to bump the primary so it "sits" in after moving the scope dramatically. That would stop this kind of things which are annoying.

Hagar (Doug) · #16 30-04-2010, 11:26 PM

I have always tried to only image on one side of the mount to prevent a meridian flip which always seems more trouble than I can be bothered with.
At least with the Ha filter we can image something while the moon is up. Seems like the only time the sky is clear here is when the moon is high or when I am at work. Eventually Iwill win even if I have to rework my roster to get some moonless nights.
Actually I am enjoying the Ha immencely. Still not too sure of full colour NB.

multiweb (Marc) · #17 01-05-2010, 12:17 AM

Quote:

Originally Posted by Hagar

I have always tried to only image on one side of the mount to prevent a meridian flip which always seems more trouble than I can be bothered with.
At least with the Ha filter we can image something while the moon is up. Seems like the only time the sky is clear here is when the moon is high or when I am at work. Eventually Iwill win even if I have to rework my roster to get some moonless nights.
Actually I am enjoying the Ha immencely. Still not too sure of full colour NB.

I try to avoid meridian flips but sometime you have no choice.
Ha on its own is alright. Sii's hard . Oiii is quite easy and you can do some real nice bi-color pics. So you use L (Ha) R (Ha) G(Oiii) B(Oiii). That will give you very nice red and blue tones. I did that on the Eta shot I got in the compendium and also here on M16. Works a treat.

gregbradley · #18 01-05-2010, 09:50 AM

That's a great result. Nicer in widefield.

The Hyperstar has come a long way. When it first came out the results seemed crude. They must have developed it a lot plus the cameras are better now too.

Greg.

multiweb (Marc) · #19 01-05-2010, 10:48 AM

Quote:

Originally Posted by gregbradley

That's a great result. Nicer in widefield.

The Hyperstar has come a long way. When it first came out the results seemed crude. They must have developed it a lot plus the cameras are better now too.

Greg.

Thanks Greg. I love the hyperstar. Bit fiddly to fit on and off but I'm getting better at it. Once it's on it so easy. It's "imaging for dummies" (this one anyway)

jase (Jason) · #20 03-05-2010, 01:10 AM

Impressive Marc. What captures the attention is the dark rifts of nebulosity in the scene. Good work, well done.